Not until they left school________how much their teachers loved them and helped them.
| A．they realized | B．did they realized |
| C．the would realized | D．had they realized |
This is the biggest lab__________we have ever built in our university.
| A．which | B．what | C．that | D．Where |
He is__________as a leader but he hasn’t__________in teaching.
| A．success; many experiences | B．a success; much experience |
| C．great success; an experience | D．a great success; any experiences |
Only by practising constantly__________ greater progress.
| A．we can make | B．then we will make |
| C．can we make | D．we must make |
__________ printed, this science fiction will be popular among the students.
| A．Before | B．Unless | C．Although | D．Once |
. —I’m leaving for Canada on a study trip next week.
—_________.
| A．Enjoy your time | B．That’s all right |
| C．You’re welcome | D．It’s a pleasure |